Changes in brown adipose tissue composition during fasting and refeeding of diet-induced obese mice
| Autor: | D. V. Muralidhara, M. Desautels |
|---|---|
| Rok vydání: | 1994 |
| Předmět: |
Male
medicine.medical_specialty Physiology Ratón Animal feed Adipose tissue Mice Inbred Strains Biology Mice Adipose Tissue Brown Physiology (medical) Internal medicine Brown adipose tissue medicine Uncoupling protein Animals Obesity digestive oral and skin physiology Body Weight Fasting medicine.disease Animal Feed Diet Endocrinology medicine.anatomical_structure Energy Metabolism Food Deprivation Diet-induced obese Thermogenesis Body Temperature Regulation |
| Zdroj: | The American journal of physiology. 266(6 Pt 2) |
| ISSN: | 0002-9513 |
| Popis: | The objective of this work was to evaluate how obesity would influence the changes in brown fat (BAT) thermogenic capacity during fasting-refeeding. Mice fed either chow or chow + high-fat supplement for 6 wk had body weights of 34 +/- 1 and 43 +/- 1 g, respectively. They were fasted for 48 h followed by ad libitum refeeding for up to 5 days. Loss of carcass fat was similar between food-deprived mice previously fed chow or chow + high-fat supplement. However, even after a 48-h fast, obese mice still had a carcass fat content much greater than that of chow-fed mice. Brown fat atrophy caused by food deprivation was characterized by reductions in tissue weight, fat, mitochondrial proteins and uncoupling protein (UCP), without change in tissue DNA. Obesity did not alter the rate or extent of brown fat atrophy. Upon refeeding 48-h-fasted lean and obese mice, there was recovery of BAT thermogenic capacity that was similar between the two groups. In chow-fed mice, an intact neural input was essential for recovery of BAT thermogenic capacity during refeeding. These results indicate that food deprivation triggers an immediate adaptive response in mice previously fed chow or chow + a high-fat supplement and that reduction in brown fat thermogenic capacity during fasting and its recovery during refeeding appear little affected by the size of the animal energy reserves. |
| Databáze: | OpenAIRE |
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